Unbonded Posttensioned Concrete Bridge Piers. I: Monotonic and Cyclic Analyses
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Volume 8, Issue 2
Abstract
The monotonic and cyclic behavior of a proposed unbonded, posttensioned concrete bridge pier system is studied using finite-element analyses. A procedure to evaluate seismic capacities based on results from the monotonic and cyclic analyses is described in the framework of a two-level approach considering functional- and survival-performance limits. A set of criteria to define functional-and survival-level displacement capacities for the system is developed. The proposed criteria represent improvements over existing criteria in that they are applicable to both conventional reinforced concrete structures and unbonded posttensioned structures. The monotonic and cyclic behavior of prototype single-column pier and two-column bent designs is presented. Monotonic analyses are performed to characterize the stiffness, strength, ductility, and limit-state behavior of these systems. Cyclic analyses are carried out to estimate energy dissipation capacity, residual displacements, and general hysteretic behavior. The influence of the degree of unbonded posttensioning on bridge pier behavior is examined. Using the finite-element results and the proposed criteria, seismic capacities of the prototype bridge pier systems are established.
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Information
Published In
Journal of Bridge Engineering
Volume 8 • Issue 2 • March 2003
Pages: 92 - 101
Copyright
Copyright © 2003 American Society of Civil Engineers.
History
Received: Jul 17, 2001
Accepted: Jan 15, 2002
Published online: Feb 14, 2003
Published in print: Mar 2003
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